I have no doubts that in some cases, the right Christian partner is a wonderful asset and could help a person get better.
In my own experience though (and I'm certainly not saying it counts more than anyone else's, just food for thought,) I have been surrounded by people who took on relationships in which they thought they could "help" or "love" the other person well, and it was a disaster.
I also think that with all the fictionalized dramas we see in entertainment (including Christian movies and TV, where God always seems to come through with some kind of one-in-a-million breakthrough,) many people tend to gloss over the bad and concentrate on the happy couple singing joyfully at church during the final shot.
I once knew a pastor who had a lifelong battle with alcohol, and one of the things he put his wife through was smashing a mirror in a drunken rage and then gashing his wrists with the broken shards. Imagine being his wife and having to try to nurse him through all of these episodes (as they happened regularly) for several decades while basically raising your children as a single parent, because he obviously can't help out. (And this is not to put everything on the men -- I've known several men with addicted wives as well.)
But when we think about romantic love, we're not thinking about this. We're eagerly romanticizing the good times and how much a partner can "help" us, rather than the utter hell that is going to break loose along the way.
My own experience in a relationship with an alcoholic resulted in him becoming much, much worse, because help only enabled him, allowing him to nurse his addictions all the more. When I met him, he was working full time, but as I did more and more, he eventually quit working altogether to take up drinking full time instead. The babysitter would call me and tell me to pick up his kids because he had called her in the midst of as slurring stupor. He wound up in the hospital because he was taking over the counter drugs (like sleeping pills,) while washing them down with two pints of alcohol. Every single day.
This thread is for the sharing of experiences in the hopes that we can all learn and grow.
As for myself, I have only seemed to find a lot more of the same -- men who are attracted to me because I'm not a drinker, I don't smoke, and I've never touched drugs (out of fear, not self-righteousness,) and so they think, "Ah, a clean Christian girl. She'll be perfect to take care of me and help support me with my issues."
Oh, I wind up supporting them all right.
You'd think I would have learned my lesson after I paid for his babysitting costs and a first and second round of legal bills that were all being caused by his drinking. I just thank God I didn't marry him (because he was asking) so that I could get out of that relationship (but nearly needed a restraining order to do so, as he kept showing up everywhere I was.)
I have nothing but admiration for those who feel they can take on such weighty problems -- God bless them, because He knows they are going to need it -- but as for myself, if given a choice, I will always opt for a lonely but quiet space of my own rather than an avalanche of someone else's issues that they have not dealt with in addition to the things I'm fighting within myself.
(Which brings us to another topic for another time -- the issues we deal with ourselves and how much should we expect a partner to shoulder from us.)